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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951ad2399fa4eea0bb458f483582ab614508d59e378fe1fbf91f2cef666dbc7b' 
  AND token = 'he+t3s5f5boqhB+TzTWjcMeSf9JSm66kIsIEiQUKNLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}